($2.99 or Kindle Unlimited) Mira keeps calling her ex for sexual relief, but decides she has to move on. When she does, though, she ends up getting involved with a serious demon. [Purchase Link]
Right up my alley, well-written characters, and hot sex! The scope of the story matches its length (there is a plot thread left unresolved, but that doesn't bother me too much), and it has a good amount of plot-to-sex.
It's not quite horror. There is stakes, but the horror element is very light in this book.